Method for improving abrasion resistance of crude terephthalic acid hydrofining palladium-carbon catalyst
A crude terephthalic acid, palladium carbon catalyst technology, applied in chemical instruments and methods, organic compound/hydride/coordination complex catalysts, physical/chemical process catalysts, etc., can solve the problem of poor wear resistance of catalysts
Active Publication Date: 2014-05-07
CHINA PETROLEUM & CHEM CORP +1
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- Abstract
- Description
- Claims
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Problems solved by technology
[0003] The technical problem to be solved by the present invention is the problem of poor catalyst wear resistance existing in the prior art, and a new effective method for improving the wear resistance of crude terephthalic acid hydrotreating palladium carbon catalyst is provided. The catalyst has the characteristics of less dust falling and low wear
Method used
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Embodiment 1
[0025] The fresh catalyst with a palladium mass percentage of 0.5% was dried at 80°C under nitrogen protection and cooled to room temperature; the ammonia-modified silicone with a number average molecular weight of 10000 and a mass percentage of 0.005% relative to the dry fresh catalyst was evenly sprayed on the On the freshly baked catalyst, the total ammonia value is 0.5, and then dried at 110°C under the protection of nitrogen. The analysis data of the catalyst are shown in Table 2.
Embodiment 2～6
[0027] Except the process condition change as shown in Table 1, other operation is as [Example 1]; The analysis data of catalyst is as Table 2.
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Abstract
The invention relates to a method for improving abrasion resistance of a crude terephthalic acid hydrofining palladium-carbon catalyst, and mainly solves the problem of easy abrasion of the catalyst in use in the prior art. The method for improving the abrasion resistance of the crude terephthalic acid hydrofining palladium-carbon catalyst comprises the following steps: (A) a fresh commercial palladium-carbon catalyst is dried under the protection of inert gas of 80-120 DEG C; (B) modified organosilicon, being 0.005-1.0% of the mass of the dried fresh catalyst and using polydimethylsiloxane as matrix, is sprayed on the dried fresh catalyst, and is dried under the protection of the inert gas; the modified organosilicon is at least one of ammonia-modified organosilicon, epoxy-modified organosilicon or polyether-modified organosilicon. The method preferably solves the problem, and can be applied to the industrial production of crude terephthalic acid hydrofining.
Description
technical field [0001] The invention relates to a method for improving the wear resistance of a crude terephthalic acid hydrotreating palladium carbon catalyst. Background technique [0002] Crude terephthalic acid hydrogenation refining palladium carbon catalyst generally has a palladium mass percentage content of 0.50%, and the main impurity in crude terephthalic acid is p-aldehyde benzoic acid at a temperature of 270-290°C and a pressure of 7.0-8.5Mpa (commonly known as 4-CBA) is converted into p-toluic acid and removed by crystallization and centrifugation. As we all know, in industrial applications, the active component palladium in the palladium-carbon catalyst is distributed on the surface of the carrier. It is a common phenomenon that the palladium is lost due to the washing of the reactants and the activity of the catalyst is reduced. The waste catalyst unloaded from the industrial device generally contains less than How to slow down the loss of palladium is a diff...
Claims
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IPC IPC(8): B01J31/02B01J31/06C07C51/487C07C63/26
CPCY02P20/52
Inventor 肖忠斌畅延青
Owner CHINA PETROLEUM & CHEM CORP